tag	line	file	source code
SER1_TIMER	96	kernel/chr_drv/serial.c	timer_active &= ~((1<<SER1_TIMER)<<info->line);
SER1_TIMER	105	kernel/chr_drv/serial.c	timer_active |= (1<<SER1_TIMER)<<info->line;
SER1_TIMER	453	kernel/chr_drv/serial.c	timer_table[SER1_TIMER].fn = com1_timer;
SER1_TIMER	454	kernel/chr_drv/serial.c	timer_table[SER1_TIMER].expires = 0;